def pay(fn):
    def f1():
        fn()
        print("支付成功")
    return f1
def order(fn):
    def f2():
        fn()
        print("下单成功")
    return f2
@pay
def fn1():
    print("支付成功")
@order
def fn2():
    print("支付成功")
fn1()
fn2()